Can I use a discount/promotional voucher to purchase a Merlin's Magical London Pass or Combination Ticket?

No, a 2 for 1 voucher or promotional voucher cannot be used in conjunction with another offer including, but not limited to, a Merlin's Magical London Pass or Combination Ticket. 2 for 1 vouchers can only be redeemed on the door when purchasing a full priced adult ticket for standard admission.